3M Attest Rapid Readout Biological Indicator (green cap). Designed for the rapid, reliable monitoring of ethylene oxide (EO) sterilization processes when used in conjunction with 3M Attest 290G Auto-reader. Detects the activity of a naturally occuring Bacillus atrophaeus enzyme, beta-glucosidase, which is one of the enzymes involved in spore outgrowth and normal vegetative cell function. Packaging: 50/Box, 4 Boxes/Case.